temperature coefficients

Temperature coefficients of resistance for copper and platinum are respectively , and Resisters made of copper and platinum have respective resistences and at
Calculate the temperature at which the two resistances will be equal. Ans.

I am very new to this but knowing that

using this simultaneously is the way to solve it. however apparently it assumes some things that I don't know to set this up....

here is an example problem

Couldn't you just substitute your values for copper and platinum individually to find R0 for both metals? (i.e. for copper sub Rt = 17, a = 0.00427, T = 20)

Then you could just eqaute R0(copper)(1+a(copper)T) = R0(platinum)(1+a(platinum)T) and solve for T.

not sure if I follow just how this is plugged in. but here is an example problem to show somewhat how this is supposed to be solved... however I don't know how they got and from this

Electrical conductivity, and hence resistence, is a slowly varying function of temperature. To a good approximation, the Resistance at temperature is related to the resistance at by:

where is a constant known as temperature coefficient of resistence of the material. If a coil has a resistence of at and at calculate (a) the temperature coefficient of resistance of the material; (b)the resistance of the coil at (a)